Find IP Address of the Client

Hello,

i want to examine the client entered country by a webservice. The input parameter of the webservice is the ip-address. I uses the method "ipadr = request->get_header_field( name = '~remote_addr' )" But this method returns always the ip-address of the WebApplicationServer Dispatcher. Instead i need the IP of the Provider where the Client logged into the internet ! Have anyone an idea ?

Best regards